Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b29e8c01865452…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 11:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3521f7ab84b2e63e38ae002d5e8cbed9 SHA-1: 21ea9b5733956109912d46bc20e3fae7478181f5 SHA-256: 97b29e8c01865452b611e4324e6177571739ac5316ae4c3d93ddaf2e04d21a24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://evaemlak.com/userfiles/file///kuxunovakewofumibupo.pdf In PDF document text
    • https://pchome.uzai.ca/upload/files/sopefibofel.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/vijuzomez.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210918191445_0yv13j.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/36130246917.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/21698311237.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/24432932760.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/juregumasepimufikofer.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/zajolij.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/62817234370.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/77581998357.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/dowiwoxowiwirejuxa.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/11028956515.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/80560435187.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/jenisa.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/57415107498.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/xawesenebu.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/kerikovirotobiviju.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109131352538476.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/rufurotudi.pdfIn PDF document text
    • http://offerparts.com/upload/files/32083854303.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/dupasu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/68e1hdrb1o48b4m4883cactr33/60098842128.pdfIn PDF document text
    • https://granitnet.hu/editor_up/dozev.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/80239907042.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/fodolodujunekomafuwajef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=note+3+android+updatePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 10420 bytes
SHA-256: a6c2da4b474884eb8edd9f0bd894af6320000fabd90f2922c8f6d766708aa256
font_01_sfnt_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 16608 bytes
SHA-256: 73440f27098aaa5fbaa28e19db3dda55c0f339c1faf8cdb63e277b61961c8f1c
font_02_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1